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CP: Chemische Physik

CP 11: Einzelteilchenspektroskopie

CP 11.12: Poster

Tuesday, March 10, 1998, 18:00–20:00, P1

The intersystem crossing of isotopic isomers of pentacene — •A.C.J. Brouwer, A.M. van Ooijen, J. Köhler, and J. Schmidt — Centre for the Study of Excited States of Molecules, Huygens Laboratory, University of Leiden, The Netherlands

Using a combination of experimental techniques, individual pentacene molecules of specific isotopic isomer types were selected. For each of these molecules the intersystem crossing (ISC) rates to and from the meta-stable triplet state were determined. A consistent trend in the S₁→T₁ ISC for the various isotopomers was observed. The picture emerging from the combined data matches a model predicting ISC enhancement due to degeneracy of a vibrational level of a higher lying triplet state with S₁.